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用不同格式显示日历年日期的 Java 程序
在本文中，我们将了解如何以不同格式显示日历年的日期。Java 没有内置的日期类，但我们可以导入 java.time 包来使用日期和时间 API。该包包括许多日期和时间类。
以下是相同的演示 −
假设我们的输入是 −
Run the program
预期输出为 −
The first date format is:2022-03-17T23:37:37.623304800 The second date format is:17/03/2022 The third date format is:Thursday, 17 Mar 2022
算法
Step 1 - START Step 2 - Declare an object of LocalDateTime namely date. Step 3 - Define the values. Step 4 - Define different date time formats using DateTimeFormatter objects Step 5 - Display the different date time formats Step 6 - Stop
示例 1
在这里，我们在“main”函数下将所有操作捆绑在一起。
import java.time.*;
import java.time.format.DateTimeFormatter;
public class Demo {
public static void main(String[] args){
System.out.println("The required packages have been imported");
LocalDateTime date = LocalDateTime.now();
System.out.println("A LocalDateTime object has been defined");
System.out.println("\nThe first date format is:" +date);
DateTimeFormatter date_format_1 = DateTimeFormatter.ofPattern("dd/MM/yyyy");
String formattedDate_1 = date.format(date_format_1);
System.out.println("\nThe second date format is:" +formattedDate_1);
DateTimeFormatter date_format_2 = DateTimeFormatter.ofPattern("EEEE, dd MMM yyyy");
String formattedDate_2 = date.format(date_format_2);
System.out.println("\nThe third date format is:" +formattedDate_2);
}
}输出
The required packages have been imported A LocalDateTime object has been defined The first date format is:2022-03-17T23:37:37.623304800 The second date format is:17/03/2022 The third date format is:Thursday, 17 Mar 2022
示例 2
在这里，我们将操作封装到函数中，展示面向对象的编程。
import java.time.*;
import java.time.format.DateTimeFormatter;
public class Demo {
static void print_date_format(LocalDateTime date){
DateTimeFormatter date_format_1 = DateTimeFormatter.ofPattern("dd/MM/yyyy");
String formattedDate_1 = date.format(date_format_1);
System.out.println("\nThe second date format is:" +formattedDate_1);
DateTimeFormatter date_format_2 = DateTimeFormatter.ofPattern("EEEE, dd MMM yyyy");
String formattedDate_2 = date.format(date_format_2);
System.out.println("\nThe third date format is:" +formattedDate_2);
}
public static void main(String[] args){
System.out.println("The required packages have been imported");
LocalDateTime date = LocalDateTime.now();
System.out.println("A LocalDateTime object has been defined");
System.out.println("\nThe first date format is:" +date);
print_date_format(date);
}
}输出
The required packages have been imported A LocalDateTime object has been defined The first date format is:2022-03-17T23:37:37.623304800 The second date format is:17/03/2022 The third date format is:Thursday, 17 Mar 2022
更新日期：2022 年 3 月 30 日
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